Abstract
The aim of this research is to investigate the state of the art in the adoption of order picking systems (OPS) and provide a broad empirical analysis built on a cross-section of 40 Italian distribution or factory warehouses. The analysis is based on multiple case studies. Semi-structured interviews were conducted with management at leading companies operating in different industries, and results are discussed with reference to the literature. The study provides an insight into the types of OPS adopted at distribution or factory warehouses. Results show the OPS type implemented, their automation level, and the main information and communication technology systems in place to support picking activities. The findings offer interesting views on how and where the different types of OPS may be appropriate based on contextual requirements.The paper fulfils an identified need for in-depth case studies on OPS focusing on their adoption level and implementation process (i.e. motivations and barriers to adoption) in warehouses and suggests areas for future research.